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Sewage treatment plant, Wilburton, Oklahoma. NPDES permit OK0021881, in force until Jan 31, 2031. Last 12 months: over a limit 9 times (last August 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | BOD, carbonaceous [5 day, 20 C], monthly average | 11.1 mg/L | ≤ 10 mg/L | 11% |
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 35.8 lb/d | ≤ 12.5 lb/d | 186% |
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 9.2 mg/L | ≤ 2 mg/L | 360% |
| October 2025 | Nitrogen, ammonia total [as N], weekly average | 13.1 mg/L | ≤ 3 mg/L | 337% |
| December 2025 | pH, minimum | 6.2 SU | ≥ 6.5 SU | — |
| March 2026 | Chlorine, total residual, instantaneous maximum | 1.1 mg/L | ≤ .099 mg/L | 1011% |
| June 2026 | Chlorine, total residual, instantaneous maximum | .1 mg/L | ≤ .099 mg/L | 1% |
| July 2026 | pH, minimum | 6.4 SU | ≥ 6.5 SU | — |
| August 2026 | pH, minimum | 6.3 SU | ≥ 6.5 SU | — |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | Jun–Oct |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 125.1 lb/d | Jan, Feb, Mar, Nov, Dec |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 15 mg/L | Apr–Oct |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 22.5 mg/L | Apr–Oct |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 93.8 lb/d | Apr–Oct |
| Solids, total suspended | monthly average | ≤ 187.7 lb/d | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Apr, May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 6 mg/L | Apr, May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12.5 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 25 lb/d | Apr, May |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year |
| Phosphorus, total [as P] | weekly average | ≤ 1.5 mg/L | all year |
| Phosphorus, total [as P] | monthly average | ≤ 6.25 lb/d | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | instantaneous maximum | ≤ .099 mg/L | all year |
| E. coli | geometric mean | ≤ 126 MPN/100mL | May–Sep |
| E. coli | daily maximum | ≤ 406 MPN/100mL | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | Apr–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | Apr–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 62.6 lb/d | Apr–Oct |
Cited limits by parameter: Oklahoma's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/OK0021881 · MCP: https://passage-data.com/mcp